Improvement in slide-doors for heating and puddling-furnaces



SAMUEL McLAvU-GHLIN, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 108,501, dated October 1'8, 1870 antedated October 8, 1870.

-..va-L--w IMPRVE'MENT I'N SLIDE-DOORS FOR HEATING AND PUDDLlNG-FURNACES.

The Schedule referred to in-these Letters Patent and making part of the name.

To all whom it may concern:

Beit known that I, SAMUEL MCLAUGHLIN, of the city and county of Philadelphia, State of Ieunsyl- Vania, have invented a new and useful Improvement in Slide-doors of Heating,T and Puddling-Furnaces; and I hereby declare the following to be a full and exact description of the construction and operation of the same, reference being:r had to the annexed drawinOr making part hereof, in which- Figure l is a front elevation of the same.

Figure 2 is a front elevation of the door, without the flanged lire-bricks.

Figure 3 is a vertical section through the line a b, Iig. 1.

Figures 4, 5, and 6 are elevations ofthe flanged fire-bricks.

The object of -lny invention is to protect slide-doors of heating and paddling-furnaces against' the speedy destruction by the irtensc heat to which they are exposed.

For this purpose I line the inner side of the door with a suitable number of danged fire-bricks, tightened and kept in their places by means ol set-screws,

nuts and face-plate, in such a rnanner as to protect .every part of the iron of the door from coming in contact with the flame andthe heat ot' the furnace.

Instead of fire-bricks I may also use flanged bricks, made of plaster, soapstone, or any other suitable niaterial which is a slow conduct-or ot' heat.

To enable others skilled in the art to make und use my invention, I will proceed to describe its constrnction and operation.

I construct a cast-iron slide-do^or, A, in the usual way, either with au aperture or hole at the bottom, or without the saine, and provided with flanges on every side, so as to forni a hollow shell. 4

In -order to protect the door, and especially thc flanges from the heat of the furnace, I construct firebrioks provided with flanges, as shown in figs. 4, 5, and 6, with which I Iill up the space between the flanges of the door and cover the saine.

The set-screws c c, the nuts d d, and the face-plate e, serve to keep the lire-bricks in their place ;at the saine time this arrangementallows me to take out single bricks when broken or dcfa-ced, and to replace them easily by new ones. l

I am aware that furnace-doors lined with rebricks have been known and used before, but I claim that my device is preferable, because itbetter protects the iron of the door.

That I claim as my invention, and desire to secure by Letters Patent, is-

The flanged fire-bricks B B B B B B, in combination with the set-screws o c, the nuts cl d, and the face-plate e, arranged substantially in the manner and for the purpose as set forth.

SAMUEL MGLAUGHLIN.

Witnesses Henin/um SPOERKEY,

HENRY FIEFENTHALER. 

